Automatic hose fillers can and have stuck and continued to run, causing fish
to die, so keep an eye on it. As far as filters, you can get a filter for
drinking water at the big box hardware stores that has charcoal filter
media. They work quite well for a period of time, but need to be monitored
with a chlorine test kit, as they will saturate and then without you knowing
it, it is doing nothing. My BIL used one to fill his ponds, and one day I
got a call to go over and see what was wrong with the fish, some were dying.
A check of the chlorine level from his filter was several times as strong as
the unfiltered hose, and registered safe for a swimming pool. Up to about
10% water changes, once a week, the chlorine or chloramine will neutralize
by attacking organics in the pond, and therefore is generally safe. More
than that it is always a good idea to add dechlor. I don't pretreat my
water in a bucket before adding it to the pond, I add the amount of dechlor
directly to the pond that I think I need is needed as I am adding the water.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html

"DD DDD" wrote in message
...
I just added a auto water pond filler. Is ther a Chlorine and heavy
metal garden hose filter? I sometimes put my backflush on to clean my
filter. I let it run in the garden then pour garden hose water in. so
far no problems. Bur if I ever do a 10-20% water change (300 gallon
pond) I dont want anything bad to happen. How much of a water change can
I do without adding declor? I can no longer lift buckets of water that i
declor to pour in the pond. Is it safe to add some tap water without
hurting the fish? I was hoping I could just backflush about 30 gallons a
week the the auto filler would fill it. Please let me knowThank again